with the normalization \(\int d\tau d\sigma \delta ^{(2)}(\tau ,\sigma ) = 1\) . This delta function was already justified in [1]} by reproducing correlators of stress tensor components in a BMSFT on a null cylinder, dual to Einstein gravity with \(c_L = 0\) . However for completeness and for generic theories with \(c_L \ne 0\) , we briefly discuss the Ward identities and 2-point correlators of stress tensor components in appendix REF . The important results are listed below.
